diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index d137b25dc5..4228f45822 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -337,7 +337,7 @@ server5-fan.crt: server5.key
 
 server5-tricky-ip-san.crt: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS Tricky IP SAN" -set_serial 77 -config $(test_ca_config_file) -extensions tricky_ip_san -days 3650 -sha256 -key server5.key -out $@
-	
+
 server5-directoryname.crt.der: server5.key
 	$(OPENSSL) req -x509 -outform der -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS directoryName SAN" -set_serial 77 -config $(test_ca_config_file) -extensions directory_name_san -days 3650 -sha256 -key server5.key -out $@
 
@@ -347,7 +347,7 @@ server5-two-directorynames.crt.der: server5.key
 # directoryname sequence tag malformed
 server5-directoryname-seq-malformed.crt.der: server5-two-directorynames.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/62A4473045310B/62A4473145310B/" | xxd -r -p > $@
-	
+
 # Second directoryname OID length malformed 03 -> 15
 server5-second-directoryname-oid-malformed.crt.der: server5-two-directorynames.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/0355040A0C0A4D414C464F524D5F4D45/1555040A0C0A4D414C464F524D5F4D45/" | xxd -r -p > $@